Join Date: Jun 2006
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I must admit, I found the post puzzling.
Zincs are supposed to be eaten away.
If they are being eaten away too quickly (and defining "too quickly" is a moving target), then it is safe to assume you have some sort of a galvanic issue, either around or in the boat.
Do you leave your shore power on when absent? Is there known current in the marina/basin?
Without knowing the length of time the zinc spent in the engine and the other particulars, it's hard to know how to absorb this "lesson".